package org.smart4j.chapter2.util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

/**
 * Created by Cai on 2017/7/18.
 * 属性文件工具类
 */
public final class PropUtil {

    private static final Logger LOGGER = LoggerFactory.getLogger(PropUtil.class);

    /*加载属性文件*/
    public static Properties loadProps(String fileName){
        Properties props = null;
        InputStream is = null;

        try{
            is = Thread.currentThread().getContextClassLoader().
                getResourceAsStream(fileName);
            if(is == null){
                throw new FileNotFoundException(fileName+"file is not found!");
            }
            props = new Properties();
            props.load(is);
        }catch (IOException e){
            LOGGER.error("load properties file failure", e);
        }finally{
            if(is!=null){
                try{
                    is.close();
                }
                catch (IOException e){
                    LOGGER.error("close input stream failure", e);
                }
            }
        }

        return props;
    }

    /*获取字符型属性（默认值为空字符串）*/
    public static String getString(Properties props,String key){
        return  getString(props,key,"");
    }

    /*获取字符型属性（可指定默认值）*/
    public static String getString(Properties props, String key,
                                   String defaultValue){
        String value = defaultValue;
        if(props.containsKey(key)){
            value = props.getProperty(key);
        }
        return value;
    }

    /*获取数值型属性（默认值为0）*/
    public static int getInt(Properties props, String key){
    return     getInt(props,key,0);
    }

    /*获取数值型属性，可指定默认值*/
    public static int getInt(Properties props, String key, int defaultValue){
        int value = defaultValue;
        if(props.containsKey(key)){
            value = CastUtil.castInt(props.getProperty(key));
        }
        return value;
    }


    /*获取布尔型属性，默认值为false*/
    public static boolean getBoolean(Properties props, String key){
        return getBoolean(props, key, false);
    }

    private static boolean getBoolean(Properties props, String key, boolean defaultValue) {
        boolean value = defaultValue;
        if(props.containsKey(key)){
            value = CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }


}
